CVE-2026-37982 MEDIUM

CVE-2026-37982: Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauthn token replay

Vendor Red Hat
Product Red Hat build of Keycloak 26.4.12
Published May 19, 2026
Last update May 20, 2026
View on NVD All CVEs

CVSS base score

6.8/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay `ExecuteActionsActionToken` tokens within Keycloak's WebAuthn (Web Authentication) flow. By intercepting an execute-actions email link, an attacker can register their own authenticator to a victim's account. This leads to unauthorized enrollment of a hardware-backed credential, enabling persistent account takeover.

Key dates

02Disclosure timeline

May 19, 2026 CVE published
May 20, 2026 Record updated